SOUP is a game developed by a developer that is unknown on April 10th, 2007. This game is heavily inspired by LSD Dream Emulator, a PS1 game where you traverse in strange dream lands over the course of 1 year.
Over the course of the game, there are 5 days. Each day has 4 to 5 different sequences of "dreams." The layouts of the levels constantly change and warp around. These changes also include who or what is standing at the center of each stage. To change rooms, just simply walk into the wall.
SOUP was most likely made in Game Maker, as the developer has other works on the same engine.